Astro365, May 14th:

On May 14, 1973, Skylab I, the United States’ first orbital laboratory launched unmanned into orbit. It included a workshop and solar observatory with X-ray telescopes from which NASA confirmed the existence of coronal holes in the Sun. Thousands of pictures of Earth were taken. Medical research for future space stations that would allow living for months at a time – learning how to live comfortably. Showering, hair cuts, jet packs, and exercise were all tested in Skylab.